Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59bd06c0f0539d1…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 07:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d61d22d9947919da0bffe72c9223c78 SHA-1: 9b769d1d686a2b7ffa623e0a4cc2e2985f23e871 SHA-256: d59bd06c0f0539d163965df3342df0be9442ce3bcca2566eaa3937bffcf6db17
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=how+do+i+turn+on+location+on+my+phone PDF link annotation
    • https://unicon-msk.ru/data/files/fuwubagi.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/43924151348.pdfIn PDF document text
    • https://hoavily.com/uploads/files/94576496192.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/12638592313.pdfIn PDF document text
    • https://sealskinz.ru/files/file/lesijefad.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210909073828_6496241.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/21816070221.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/dabinum.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/11574002041.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/22501915459.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/10848712885.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/renaxedebomokonom.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/bumov.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/57174350655.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141c288a3fa1---wofalazonureki.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/sirewadororew.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/wogupo.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/lepizaserajogasew.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613232a7074ec---35362748307.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/gowejazoxoluged.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 17788 bytes
SHA-256: fd42905a02ee53ef0278f271a64d710d14dc135fe88dab540eeebb5891cc3c04
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 10900 bytes
SHA-256: 111c517440bc8343a364c974374fe9dc7905774a9d9a382295258d4f33158bed

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